13491923 has 4 divisors (see below), whose sum is σ = 13510920. Its totient is φ = 13472928.

The previous prime is 13491893. The next prime is 13491937. The reversal of 13491923 is 32919431.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13491923 - 2⁶ = 13491859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13491923.

It is not an unprimeable number, because it can be changed into a prime (13491953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8390 + ... + 9867.

It is an arithmetic number, because the mean of its divisors is an integer number (3377730).

Almost surely, 2^13491923 is an apocalyptic number.

13491923 is a deficient number, since it is larger than the sum of its proper divisors (18997).

13491923 is an equidigital number, since it uses as much as digits as its factorization.

13491923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18996.

The product of its digits is 5832, while the sum is 32.

The square root of 13491923 is about 3673.1353092420. The cubic root of 13491923 is about 238.0626615132.

The spelling of 13491923 in words is "thirteen million, four hundred ninety-one thousand, nine hundred twenty-three".